如何在hive表中拆分字符串

Question

我有一张表emp，看起来像这样：

+----------+----+
|customerID|name|
+----------+----+
|         1| Ram|
|         2| Raj|
+----------+----+

我想拆分每条记录的字符串，我想在Hive中输出如下：

+----------+----+---+
|customerID|name|req|
+----------+----+---+
|         1| Ram|  R|
|         1| Ram|  a|
|         1| Ram|  m|
|         1| Ram|   |
|         2| Raj|  R|
|         2| Raj|  a|
|         2| Raj|  j|
|         2| Raj|   |
+----------+----+---+

Answer 1

您必须在hive中将name列转换为数组类型，然后展开以获得所需的结果。 例如：

+----------+----+
|customerID|name|
+----------+----+
|         1| Ram|
|         2| Raj|
+----------+----+

select *,explode(split(name,'')) as req from emp

+----------+----+---+
|customerID|name|req|
+----------+----+---+
|         1| Ram|  R|
|         1| Ram|  a|
|         1| Ram|  m|
|         1| Ram|   |
|         2| Raj|  R|
|         2| Raj|  a|
|         2| Raj|  j|
|         2| Raj|   |
+----------+----+---+

删除空格。

select customerID,req  from (select *,explode(split(name,'')) as req from emp) where req != ''

+----------+---+
|customerID|req|
+----------+---+
|         1|  R|
|         1|  a|
|         1|  m|
|         2|  R|
|         2|  a|
|         2|  j|
+----------+---+